BAD BAD BAD.
Left by 8:30 but it got hot fast. After 33 miles I flatted, rode it one block just to get some shade, put that one in my pocket and installed a new one. Too hot to pump it up rock hard so I rode it soft for 200 meters just to feel a breeze ... and that one flatted. So I thumped my way 2 miles to a nearby park (which was filled with a delightful pack of screaming kids), sat in the can (to get out of the sun) to try and patch the original tube, but gave up after 4 patches cuz it STILL leaked. "Screw it!!", so I doused myself in water, and rode the last 5 miles on a flat rear. At one point, just before reaching the park, I had stopped sweating. It's too hot to ride, don't do it.
40 miles in 3++ hours. A hell of a workout, but way to Eff'n hard!!!